/**
 * customEvent ponyfill
 * @param eventName
 * @param params
 * @returns {*}
 */
export default function customEvent(eventName: any, detail: any): any;
/**
 * customEmit - emit customEvent
 * @param element
 * @param eventName
 * @param params
 * @returns {*}
 */
export declare function customEmit(element: any, ...args: any[]): void;